Faced with a choice between starvation and our least favorite food, I have a feeling most of us would accept the food willingly. I'm certainly no fan of most vegetables, but faced with a choice between them and starvation, I'd willingly eat.
The Israelites, however, had a different idea. In their rebellious eyes, God owed them something better than "manna". One would think having God personally serve your breakfast every morning would cause you to bow down in adoration, but apparently, this wasn't how the Israelites saw it. So God, in His anger, gave the Israelites more than their fair share of the meat they asked for, right up until they puked from the taste.
The Bible often compares spiritual truths to physical food. Jesus said things like "Man shall not live by bread alone, but by every word that proceeds from the mouth of God." (Matthew 4:4) and "I am the bread of life. He who comes to Me shall never hunger, and he who believes in Me shall never thirst." (John 6:35). But as beautiful a concept as that is, it comes with a caveat. Jesus compares Himself to manna (John 6:49-51).
Let's be honest here, none of us really like everything about the Bible. Sure, we all love the idea of eternal life, and it's great knowing that even the worst possible hardships we can ever face have a purpose behind them, but what about the less cheerful bits? What about the inevitable persecutions? The harsh punishments? The genealogies none of us enjoy reading? The fact that we, or someone we know, disagrees with a specific command given by God? The very existence of Hell? These are all things that may cause us to say "our spiritual appetite is gone, there is nothing to look at but this manna." We need to remember what God did to those who turned their noses up at the food He provided them. He gave them their heart's desires until they were sick of it. Compromise God's word, you'll reap the harvest of that compromise.
We look back at the Israelites and think "wow, how ungrateful were they that they would rather be slaves in Egypt than be in the wilderness being personally fed by God". What possible excuse can we have for looking at the Bible and thinking it would honestly be better if we just weren't Christians? Or if we just cut out the bits of the Bible we don't like? 3,400 years later, nothing has changed. God is still the same God, and humanity is just as stiff necked as our predecessors in the faith. How glorious is He that He doesn't just abort mission?